Monte Carlo Based Seismic Hazard Model for Southern Ghana
محل انتشار: ژورنال مهندسی عمران، دوره: 4، شماره: 7
سال انتشار: 1397
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 340
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شناسه ملی سند علمی:
JR_CEJ-4-7_005
تاریخ نمایه سازی: 6 آذر 1397
چکیده مقاله:
Seismic hazard assessment involves quantifying the likely ground motion intensities to be expected at a particular site or region. It is a crucial aspect of any seismic hazard mitigation program. The conventional probabilistic seismic hazard assessment is highly reliant on the past seismic activities in a particular region. However, for regions with lower rates of seismicity, where seismological data is scanty, it would seem desirable to use a stochastic modelling (Monte Carlo based) approach. This study presents a Monte Carlo simulation hazard model for Southern Ghana. Six sites are selected in order to determine their expected ground motion intensities (peak ground acceleration and spectral acceleration). Results revealed that Accra and Tema as the highly seismic cities in Southern Ghana, with Ho and Cape Coast having relatively lower seismicities. The expected peak ground acceleration corresponding to a 10% probability of exceedance in 50 years for the proposed seismic hazard model was as high as 0.06 g for the cities considered. However, at the rather extreme 2% probability of exceedance in 50 years, a PGA of 0.5 g can be anticipated. Evidently, the 2% in 50 years uniform hazard spectrum for the highly seismic cities recorded high spectral accelerations, at a natural vibrational period within the ranges of about 0.1-0.3 sec. This indicates that low-rise structures in these cities may be exposed to high seismic risk.
کلیدواژه ها:
نویسندگان
Jack Banahene oSei
Department of Civil Engineering, Kwame Nkrumah University of Science and Technology, Ghana
Mark Adom-Asamoah
Department of Civil Engineering, Kwame Nkrumah University of Science and Technology, Ghana
Ahmed Ali Awadallah Ahmed
Department of Civil Engineering, Kwame Nkrumah University of Science and Technology, Ghana
Eugene Boasiako Antwi
Department of Civil Engineering, Kwame Nkrumah University of Science and Technology, Ghana